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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b14f6e30b5d3b5588e9ba2f1892a064b953b3d001c6438b0c2dcfd9eac6dee' 
  AND token = '/L6vPERR+YUp6xe3lyoFSLvox/NcjVD77FK/+KXLs5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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