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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88437916aec1ccac2a4011a0643ccfcbbaeeb37dd5bff8843546891a8846074' 
  AND token = 'X1xcP8OSGgF9IyVE1cUJ89U9elu6l0qQamL0oE6DKxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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