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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f404b22fe5ec52e76e3af1d3a3e8ad1d61e0b9d098937ec82f4c52323a3500' 
  AND token = 'oXd68CEkfwF1lks0iWNcVOadKgyY3OBexgZyR2ibYHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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