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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e64f571b5dc8d83286df67e6bc7a837039884bd216d1cc545ac529fd19b685' 
  AND token = '5hu3bj6afAtpDiHRQBtWMgPIRwrjw9S6xfhadBafcZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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