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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a5a5cd0d818c310f5ee2e117cd996280a659abf0b61c878366c376cc32e7f3' 
  AND token = 'XyetRiUG1rPdyHDDE/XWhT9VBdWCj56gEwrnQgh8h9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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