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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba24a10201d44cd52e3336b8344ce9ed84f7b496a0273db473edb28b639f922e' 
  AND token = 'l157rOucni1+227C7+mkzxxFj35ItKOYmWxF7YYjrJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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