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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc4bc9eb2622eb41995cf67434f5a9f128f64f708ce9a10bef078a1d34350a6' 
  AND token = 'yNvzXTnVkB9gpI41c0vSd+WJdlNtV3DAKCEoyRkWlD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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