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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568ea60a930549e723835d1ffe5b4442815dffca69814bd1e00e62d96f275fc0' 
  AND token = '7Bn8kCTil2pvYYjTkt1pHiY9d0aHU4gEDk4kK/5ePTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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