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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a683ad65d048cf93dc4b4041c9f51418811490c7bd7a585f6535d26d0029c216' 
  AND token = 'YZ1rHLt6qWx6wgDE2oLZ7dHtOzBtX4n+IXamRIOVCQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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