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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f5bfe7bc086c78a90a7cd53b37761959d2b8ccb7a70093457ddb022bcd8a90' 
  AND token = 'XRXW3LAG/ja3fkcmx8xXHnPLFfX0KXf1aS3s7YjF08U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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