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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a88c8a96dcccaae0cee4aa6cbb985cfc44d32c5fd3ab48770d617b50dde1345' 
  AND token = '4UhR/8cia8aOLPCwOmE73Hi8moEXISgXWix93wrmAlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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