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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91795b8fbe32da5bb71d29697dd829fdb2fd3fbf64074b560a226af64f39aa54' 
  AND token = 'yraVt1cRBWm2K1Dd0LYE/zcOMbtNUbclk6U/meOFen8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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