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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3631281758d7fdb1de5dad53e26835bdd5cb5a5cf192c0788f3a6fd3d1e9555e' 
  AND token = '4U+qoVfpi5KeQxpiaFFIQ0d5avs1rG+86mq4SeHnkws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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