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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f2cabcff93093848eda4ebe41feb334b77478488eac5f8602231b956a3dbb9' 
  AND token = 'odAh6/BheYOtOWKnBoviC9bVW9sGCWry0rn8O3FFVfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}