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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8419b9674920054ac70f5b03c138049b935ae550b61f1030a85f8b55a3b902a3' 
  AND token = '9NM+qgHI9fngvjhcOjeVP+0od0aY1uAxKc3pEVXspo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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