SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0d065a1830bcf924fa8ee2bd99e3f0b8fd72fd75898946c367a458a63c845c' 
  AND token = '06eEl56zuX1KVbh4EPXXAGgqZq5+CSAOS9TH4jq71DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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