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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc7a9f0d558d019d7ef80b7c9be8e8ef1c78d2408a527678acf151bd16d1d72' 
  AND token = '4hlFu8It2Ac2QR6+D+juw/rF4D2oyCohqpnm04hAXk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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