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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4398b8af3919e8a2525aa96b3d48d7277444f85b176e6cc995933c690c0ed0a4' 
  AND token = 'wRfz9TMdZjKAia2Sj/bb9/SWkA3aPD2h3tx28nDEkmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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