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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed9383f285c7e633cc0e4b25ae70bb015276418ae2e558c27a54e7108fccaa2' 
  AND token = 'MYofV2XT9DM/BWjbSh5/DlGXwFSgolpbNbBDFemx8lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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