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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58636690d7a0585d4831ae5daf7ce29327d84f80c13560aa40056466a365a073' 
  AND token = '3sHQwUf8GCWC5s2+tncWNsAtSO8xZ4HSBmGRol9lZxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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