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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b476419e208e7fc7708b70377598de5a25c721cc860564f2bb7f975f0c2173a8' 
  AND token = 'H/245exWm5wCxlg5IevWzSTF5TnNMwoCjX8w0VnIe2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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