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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33bb5a8fdae3a4011dc31e69177b62bbbf187c61ab47f669952e4bda7d19ae8e' 
  AND token = 'vjG0zDFaVK5XdAcga7klFu0r/f2jzaIOnAEZPVKOViE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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