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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f34a51014440fb2afdbe2a903f0468410c9530abc8f651a4970687b18dea0c6' 
  AND token = 'SgxF6E8jNFIE6txY9Dvknp8uFG8X8A9mc0LiEj2gYIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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