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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798ab365cf4efa8752501a0937e4789256eaac324ae13d50eb148a3e74d25d92' 
  AND token = '9lwvku6gabKyNynovgNrRJ3IRgb0i8S0SUhwlRGgQj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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