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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e30f806862fc0f2216e58b7b5cf7cd833c5a4ebf906a1902129a7a501eda1b' 
  AND token = 'G8uYaLzWH++LeT++azPaHzh+euqrLH/0VBCNKmbGOU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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