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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b8a258d0155a7bfc7b164d8376e56d0c6b1d7404b9db660b65e29448ebbffc' 
  AND token = '2yH4jNac+TEbf0noUXw0cYwXliisxoD+CRSHZDnCsgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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