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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cc50823961fac2198d419c8939759fa4a6c9d2ef5efb69c4b38c8fac3eb813' 
  AND token = 'UGa0XR1Cp0ueHcf3OWr0fyDzuA7Aggpo5J1Ko25SuoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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