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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41747201197b5b21859a405f3d700d9f036227248eaa6dcc9e4024297c61c1a' 
  AND token = 'yiDKzv0pmDaR/CahPM/JkpsV0vV7QKX2Gq1Nzl4NDiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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