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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b380a9b972b1d1ae893762d4ab38d7ff609a8eb9e2430be6c56359a5515105' 
  AND token = '0yxAATr7ljptOlbC+D5oiifC0cidLRL8HWSdXN63JIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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