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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7ef8737771ea8ad4e3927b8b2ea2ef0a2161ab969183fa5831f18b1d336781' 
  AND token = 'MNCUqgV998swR9hn6RqIT/5c4QzNjRE9jz/cyZVeF0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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