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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8791785775fc8d26dd83269e9767b1ea508c1d255276572cb6072b27c4f585c0' 
  AND token = '1lDzyKa7isRG5na8VlOC/sJFogPXrDCJHFNdkp/rwcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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