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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3a81bab0261add6984dae1f1c84dfcbaf0823919a8a01c1f0fb4816b6a7ee4' 
  AND token = 'Z9XL1/cCWtel+GLta22Cyn41t21I+PrYZuiHBNJ4yQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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