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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef69cecd9b2ef325c7c37be6596d3bc343939eea39977546e3948c9996737a4' 
  AND token = 'wTXTx8RH470q2sUd4B747P8/mmdQYx8jFzhu5P7CKYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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