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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9093795673ac425be6d63b4f4f26920d526bcbbc34c4a48072d7dae6c47004' 
  AND token = 'LLPjFW/DdKDKjWdATOAM9XBnUd1g5l3N5Zcvw++okdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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