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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85844e78815815574fb8943b6322cf56852fd927553ee5dd4954bc7bf576552' 
  AND token = 'T4IxBrCiHiOmT8cvr3zYMKmqElzalGIaS8hkmle5qQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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