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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01cb68da142c89ffea7497f7a22e44d988631d1748989f8a4c814161bbd66e4' 
  AND token = 'F+pWmxg8aPRqsYNam/eCtNnQWAv+9M/gMK1bfw4aKGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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