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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb605aeefe72b2b7d9b9aa5a6a6cbcd11fd1cede1dcda419ea26ba093a4826b' 
  AND token = 'baVkh3Jojxd+IW248Bd/ee2w1NLcOcONViXBnIh//1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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