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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f5008facb19cd2be8c9177e14a49083df1517b84fc616f1fb20ae0ee2159e8' 
  AND token = 'ctAwVKEa6mb3363MNBNwG+2es3xf8JLNYM5SiSr6aZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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