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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8446fc2718283c867e0e81d0425f5930fd5f831a2634785f1449f3f54b56525' 
  AND token = 'qtRVqt9uLXGTTcInB6jHn3547drH/fxnMI7U3QD4Npc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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