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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8ad3703e382ee8b2257c3d85b4e4b9e89337f08e5251b72d8a5b1b6e1d7f8d' 
  AND token = 'ltooqwKP6DbkeIyRlFQ+2NF/QKyOkhZ7PbtRARhPuEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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