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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbe325dc0eb44164a7eca406ad38d348c8248e7f93607343ec0aba07d83117b' 
  AND token = 'U62lHplQnXsX3K6Sfki5rJGKD8Fc2RHae2HBBIclRv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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