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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9bf1231996bf2ada87044d8bfc27f161ed44ccbff6b2532fd89b895355d650' 
  AND token = '7PAxfCJHXTnGc01p3GK4zm8tZA1tzWVii1gYARaeDkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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