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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192961612b88683b238f20d428ea7e4ba78a73f6635fd0e8bf70113615e17c7c' 
  AND token = 'tb1aE4ZfmNqYX4FtEM0YrQ65ZRli7QAaDMpA3H0Ypmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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