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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0317d86a4de3cdbf824fd381423ddd02b55a94e80405cbbbc24dfd58cff1309' 
  AND token = 'KdHt31A2snrKN5xoGIuM4xvF7QSmjvHBNmB1+lNkYw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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