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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6da30cdd4bf4ec340fe8b7c787719520b28809491a7b95e68835245c0084962' 
  AND token = 'lnQjyPsRBNMKfk6tIRBGEW5lP5XKJOn0LoU8SQ5zthg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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