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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc1b0ee5444558fa9d3347fc1ce16062c3e9f9655cdc16c06ac54bd8c77a98f' 
  AND token = 'nSeOg8PlFWaxvRMMj2m1gibbTyt/gfha9gmV6ed5p2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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