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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103a39cf538faefd019ae9c2be7c6a474cef3431f0f16af51f5d523362355285' 
  AND token = 'Ia/oODcyPAiIZ5bL40HwRD5hCyeEvACbbGRz93f9f5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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