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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615a590c4929f9ad3441db942db768f99308bf936cbf7d3e93c683584b44fde6' 
  AND token = '8uczat5Yy2pRurxJ1DDmV5s76RLGaA74+D10TJ/UU9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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