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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9932544d39c05b03d243fa4086678b9d1085a0951d77cd5edb6691cbb26b8116' 
  AND token = 'zQaG84VUR1h02xbbt7tMw53YXwP7MoHLOgzh/p9wdEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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