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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911d1029960d0f44842b09a58e6301a7def64bef62f6c813589a857e939a5085' 
  AND token = '3S7oTUB1gr+ymNNVK5xTfOCMKP3eoqIsumn8xBfvXss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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