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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8db8817b9b393d3450b6e425f2a5939c82c42baabbb18e3d78e9dcd76bd1cf' 
  AND token = 'baG8tmtMHm0YGQptrzk4lx5dENt7ttK+mnH1+mmz18E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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