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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e8b66100e0893032f448fd8ccd19518947618b98f74f830a31727684c822be' 
  AND token = 'u+cvKunYrd7t2HoRfSPp0sJ76K2cr7RuxDo5dV5yDzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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