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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497ff2b2e626860262b10033f062c353c4e4a5f5e32aa081c37112359924fecf' 
  AND token = 'aQRWNk0MecnTxxbHzP9Q2cfuc4z7Ztj60rxLhzTuI9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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