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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1da707bd2f3528bb3b5a70e7ac973a58bdd6f4a5cf13368a512b193635c2942' 
  AND token = 'pRtQIZP0Ho0breMcc7/Hpdbcs8LvlKtfqhER//xgRJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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