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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832e5f233fb83bbbc86749e56a356f969bc5b87fccc9b623d8c460c67e16a2fe' 
  AND token = 'ELCw5lTiKXMuBaDKbH+nIC5qS+Bfy3EM8z0rnhSV01E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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