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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daed6067c210f139edd68365d4d2729e18d109a9a3b86e58331a7ba72a2c38e0' 
  AND token = 'S1jcUKa0fMyo/BZvaTKTN0nn0iV+8pS9i6JRpbbPWl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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