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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6b69b613c146f563c1c6f9a5c1312f552bdb6ef54de030f089d75e47ccafcc' 
  AND token = 'VKZC6PzfWgsmD2SPTEzWwOBVaxEu92A2wiR7O6DxwDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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