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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37657206d7ff57de9dfb893de3d7816ad5fce7879155d568a0a63a40da555758' 
  AND token = '5eKvZsIL8qCrKKTfi6G/kN3Erv5rSdrCdtwo6kZKi18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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