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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c7a58c1f0d0e0c7d9cd061b284cf19be6e632c6e6ebe61a2e3c8cfae570f3b' 
  AND token = 'p40MNhtsa2kOOoqD+ChwLEj9wrlZzIxSmIubZjvgBEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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