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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01df6ea89bfcb447afc6e757138e61fce4e8a5f054a1a7b336132514e9450cee' 
  AND token = 'bNEzk7TbHTEvdE57jQkTJfANHzULWmql2YUwH2GzR8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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