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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0562311316de092c4ded49fc677ad66f4cb380e1a56a0a9ca6c23671a6f393' 
  AND token = 'QGi5/JSGUZ2jlCmCdpmWKNZhGoR5JKG5porGRrI82Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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