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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd556c04f80ac3209f6532a88f62ccf2719670099ebdeb8a9a4489aa75826efd6' 
  AND token = 'wW7gvxW5OBmBrH4QQMH44wgMzsweWHP65Zk/WQba85A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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