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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76b38bb31aebd8a42fba05b45c9000016e174ab70dbad5e08b620cb5a89901f' 
  AND token = 'hEIAeNqShnPBqAcVYc0pYaLVztnfR16mGxU/J/5GIz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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