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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4631fbc0bcb5fbca8823a7371f4187b88ae9bc70ecfec6591ae6f94e68ded1af' 
  AND token = 'LrmEl/++kzE6c0Vkz/id/2iBAZJFa/mAzvQW+cBqe30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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