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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567b732d4592b0faaf24f3687c082079bf7ab0fbe227f04816253cc4373de3df' 
  AND token = 'lliTvStVEe4yc6RsxQi09p8g6vHf6Yxq2aGTroDWk+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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