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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1872d70566741dca931fc6d6593bb9211029ffc3d6766d79b1642301f18ee5d1' 
  AND token = 'dk8ZPjhgH2zbau37qaTdq5qltlb5BqgC0yjf3tZuwcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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