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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2910abbca6224dd1e3b4974187670bc87356e153d8ce7c6e73300e058de181c3' 
  AND token = 'P8GFZwZppDGmq2/d9QcOWiecyO2JBhjv8c3upd5TTPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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