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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a282cd76a85f199c59d374b27665f7ed868bf14863021e89a6c8f99772c28b19' 
  AND token = 'WL+LqfROp4cKEoITNt1XcCmfeW0PMnpWvh0qbEI7IEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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