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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714e10f38da2b60e72be1c1ea1eb74c6d728707f9bbda5b388cecf499ca1fe60' 
  AND token = 'LvQs21dNuGxySnzKbi+9T1WKwW5Uj0aQUVOlTuMZado=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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