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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d7ccc1a8b57b1293b2710836dc60fd164d48e790026a89e06276c02d06b6ed' 
  AND token = '4RvkO3kTWjiWBag4J7VTVr0J6OvBg+pDciJ91ZRiOqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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