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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c6d49537c78d78db51d73120b5d70f236204f17895cbbe2f9a242232b870f7' 
  AND token = '81670o8cdlfAI8koZHFAU2qTH4W68g70teWhGxqLkYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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